<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 登陆头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登陆表单区域 -->
      <el-form label-width="0px" class="login_form" :model="loginForm" :rules="loginFormRules" ref="loginFormRef">
          <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
          <!-- 密码 -->
        <el-form-item prop="password">
          <el-input prefix-icon="iconfont icon-3702mima" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data () {
    return {
    // 登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 登陆表单验证规则
      loginFormRules: {
        // 验证用户名是否合法
        username: [{ required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }],
        // 验证密码是否合法
        password: [{ required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登陆表单
    resetLoginForm () {
    //   console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login () {
    // 如果返回的对象是promise，可以用await和async来简化操作对象,await只能修饰async定义的对象
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) return false
        const { data: res } = await this.$http.post('/login', this.loginForm)
        // console.log(res)
        if (res.meta.status !== 200) return this.$message({ showClose: true, message: '登陆失败', type: 'error' })
        this.$message({ showClose: true, message: '登陆成功', type: 'success' })
        // 1、将登陆成功后的token，保存到客户端的sessionStorage中
        // 1.1项目中除了登陆之外的API接口，必须要在登陆之后才能访问
        // 1.2token只应该在当前网站打开期间生效，所以将token保存到只在会话期有效的session Storage中
        window.sessionStorage.setItem('token', res.data.token)
        // 2、通过编程导航跳转到登陆后的主页，'/home'
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #ffffff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eeeeee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #dddddd;
    position: absolute;
    right: 50%;
    transform: translate(50%, -50%);
    background-color: #ffffff;
    img {
      height: 100%;
      width: 100%;
      border-radius: 50%;
      background-color: #eeeeee;
    }
  }
}

.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
